Launched January 6, 2026
UAParser.js
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The Essential Web Development Tool for User-Agent Detection. UAParser.js is the most comprehensive, compact, & up-to-date isomorphic JavaScript library to detect user's Browser, Engine, OS, CPU, and Device type/model. Runs either in browser (client-side) or node.js (server-side).
UAParser.js is a compact JavaScript library that detects browsers, OS, CPU, engine and device info from user-agent strings.
- for
- Web developers needing reliable client-side or server-side user-agent parsing.
- pricing
- paid
- license
- AGPL-3.0
works withJavaScriptNode.jsREST API
Key features
6 features of UAParser.js
- Complete detection — Identifies browsers, OS, CPU, engine, device type, bots and AI crawlers.
- Minimal overhead — Dependency-free, small bundle (~12 kB minified) with low runtime cost.
- Isomorphic API — Same API works in browsers and Node.js environments.
- TypeScript support — Provides TypeScript declarations for typed development.
- REST API option — Managed service offers a language-agnostic REST endpoint for parsing.
- Experimental GPU detection — Can extract GPU info from WebGL data as an experimental feature.
Use cases
- Tailor UI/UX based on detected browser and device capabilities.
- Log analytics with accurate OS, CPU and bot identification.
- Serve different assets or redirects for specific device types.
- Validate client capabilities in server-side rendering pipelines.
UAParser.js FAQ
Can UAParser.js run on both client and server?+
Yes, it provides a single API that works in browsers and in Node.js.
Is the library dependency-free?+
Yes, UAParser.js has no external dependencies and keeps the bundle size compact.
Does it support TypeScript?+
TypeScript declaration files are included for typed development.
Is there a hosted service for parsing?+
A managed REST API service is available, allowing any stack to use UAParser.js without maintaining servers.
What licensing options are available?+
The open-source edition is MIT; commercial editions use an AGPL license with one-time fees.
Summarized by DevHunt from uaparser.dev · Oct 7, 2026. Details may change; check the official site.
